A Clarkston man was killed Sunday after apparently running off the roadway and going airborne before hitting a tree in Springfield Township.

Ryan Lee Johnson, 26, was pronounced dead at the scene of the crash, on westbound Holcomb Road east of Brook Lane two hours after the late-night accident.

The vehicle was found -- with its engine sitting outside the car, the roof split open and a hole in the floorboard -- one foot off the ground at rest after allegedly wedging itself with the tree in midair, said investigators.

According to Oakland County Sheriff's deputies, Johnson apparently lost control of his 2007 Pontiac Grand Prix while traveling at a "high rate of speed." He first ran off the roadway to the right, came back on the road, then went off the roadway to the left, deputies said.

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The Clarkston man was the only motorist involved in the accident.

The impact of the crash was apparently so great that "the engine was found outside of the vehicle, off the roadway east of the scene," wrote sheriff's office officials in a Monday release.

Oakland County Medical Examiner's Office investigators confirm that Johnson died accidentally from multiple injuries in the crash.

Johnson was wearing a seat belt, authorities said. Toxicology results should return within up to two weeks, death investigators added.

Staff writer John Turk covers the Oakland County Board of Commissioners, police and general assignment. He can be reached at 248-745-4613.